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    <title>Animate a feature movement</title>
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        <a class="navbar-brand" href="./"><img src="./resources/logo-70x70.png">&nbsp;OpenLayers 3 Examples</a>
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  <div class="span12">
    <label for="speed">
      speed:&nbsp;
      <input id="speed" type="range" min="10" max="999" step="10" value="60">
    </label>
    <button id="start-animation">Start Animation</button>
  </div>
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      <div class="row-fluid">
        <div class="span12">
          <h4 id="title">Animate a feature movement</h4>
          <p id="shortdesc">Demonstrates how to move a feature along a line.</p>
          <div id="docs"><p>This example shows how to use <b>postcompose</b> and <b>vectorContext</b> to animate a (marker) feature along a line. In this example an encoded polyline is being used.</p>
</div>
          <div id="tags">animation, feature, postcompose, polyline</div>
          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Feature.html" title="API documentation for ol.Feature">ol.Feature</a></li>,<li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.format.Polyline.html" title="API documentation for ol.format.Polyline">ol.format.Polyline</a></li>,<li><a href="../apidoc/ol.geom.Point.html" title="API documentation for ol.geom.Point">ol.geom.Point</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.source.BingMaps.html" title="API documentation for ol.source.BingMaps">ol.source.BingMaps</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li>,<li><a href="../apidoc/ol.style.Circle.html" title="API documentation for ol.style.Circle">ol.style.Circle</a></li>,<li><a href="../apidoc/ol.style.Fill.html" title="API documentation for ol.style.Fill">ol.style.Fill</a></li>,<li><a href="../apidoc/ol.style.Icon.html" title="API documentation for ol.style.Icon">ol.style.Icon</a></li>,<li><a href="../apidoc/ol.style.Stroke.html" title="API documentation for ol.style.Stroke">ol.style.Stroke</a></li>,<li><a href="../apidoc/ol.style.Style.html" title="API documentation for ol.style.Style">ol.style.Style</a></li></ul></div>
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        <form method="POST" id="jsfiddle-form" target="_blank" action="http://jsfiddle.net/api/post/jquery/1.11.0/">
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var route &#x3D; /** @type {ol.geom.LineString} */ (new ol.format.Polyline({
  factor: 1e6
}).readGeometry(polyline, {
  dataProjection: &#x27;EPSG:4326&#x27;,
  featureProjection: &#x27;EPSG:3857&#x27;
}));

var routeCoords &#x3D; route.getCoordinates();
var routeLength &#x3D; routeCoords.length;

var routeFeature &#x3D; new ol.Feature({
  type: &#x27;route&#x27;,
  geometry: route
});
var geoMarker &#x3D; new ol.Feature({
  type: &#x27;geoMarker&#x27;,
  geometry: new ol.geom.Point(routeCoords[0])
});
var startMarker &#x3D; new ol.Feature({
  type: &#x27;icon&#x27;,
  geometry: new ol.geom.Point(routeCoords[0])
});
var endMarker &#x3D; new ol.Feature({
  type: &#x27;icon&#x27;,
  geometry: new ol.geom.Point(routeCoords[routeLength - 1])
});

var styles &#x3D; {
  &#x27;route&#x27;: new ol.style.Style({
    stroke: new ol.style.Stroke({
      width: 6, color: [237, 212, 0, 0.8]
    })
  }),
  &#x27;icon&#x27;: new ol.style.Style({
    image: new ol.style.Icon({
      anchor: [0.5, 1],
      src: &#x27;data/icon.png&#x27;
    })
  }),
  &#x27;geoMarker&#x27;: new ol.style.Style({
    image: new ol.style.Circle({
      radius: 7,
      snapToPixel: false,
      fill: new ol.style.Fill({color: &#x27;black&#x27;}),
      stroke: new ol.style.Stroke({
        color: &#x27;white&#x27;, width: 2
      })
    })
  })
};

var vectorLayer &#x3D; new ol.layer.Vector({
  source: new ol.source.Vector({
    features: [routeFeature, geoMarker, startMarker, endMarker]
  }),
  style: function(feature, resolution) {
    // hide geoMarker if animation is active
    if (animating &amp;&amp; feature.get(&#x27;type&#x27;) &#x3D;&#x3D;&#x3D; &#x27;geoMarker&#x27;) {
      return [];
    }
    return [styles[feature.get(&#x27;type&#x27;)]];
  }
});

var center &#x3D; [-5639523.95, -3501274.52];
var map &#x3D; new ol.Map({
  target: document.getElementById(&#x27;map&#x27;),
  loadTilesWhileAnimating: true,
  view: new ol.View({
    center: center,
    zoom: 10,
    minZoom: 2,
    maxZoom: 19
  }),
  layers: [
    new ol.layer.Tile({
      source: new ol.source.BingMaps({
        imagerySet: &#x27;AerialWithLabels&#x27;,
        key: &#x27;Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3&#x27;
      })
    }),
    vectorLayer
  ]
});

var moveFeature &#x3D; function(event) {
  var vectorContext &#x3D; event.vectorContext;
  var frameState &#x3D; event.frameState;

  if (animating) {
    var elapsedTime &#x3D; frameState.time - now;
    // here the trick to increase speed is to jump some indexes
    // on lineString coordinates
    var index &#x3D; Math.round(speed * elapsedTime / 1000);

    if (index &gt;&#x3D; routeLength) {
      stopAnimation(true);
      return;
    }

    var currentPoint &#x3D; new ol.geom.Point(routeCoords[index]);
    var feature &#x3D; new ol.Feature(currentPoint);
    vectorContext.drawFeature(feature, styles.geoMarker);
  }
  // tell OL3 to continue the postcompose animation
  map.render();
};

function startAnimation() {
  if (animating) {
    stopAnimation(false);
  } else {
    animating &#x3D; true;
    now &#x3D; new Date().getTime();
    speed &#x3D; speedInput.value;
    startButton.textContent &#x3D; &#x27;Cancel Animation&#x27;;
    // hide geoMarker
    geoMarker.setStyle(null);
    // just in case you pan somewhere else
    map.getView().setCenter(center);
    map.on(&#x27;postcompose&#x27;, moveFeature);
    map.render();
  }
}


/**
 * @param {boolean} ended end of animation.
 */
function stopAnimation(ended) {
  animating &#x3D; false;
  startButton.textContent &#x3D; &#x27;Start Animation&#x27;;

  // if animation cancelled set the marker at the beginning
  var coord &#x3D; ended ? routeCoords[routeLength - 1] : routeCoords[0];
  /** @type {ol.geom.Point} */ (geoMarker.getGeometry())
    .setCoordinates(coord);
  //remove listener
  map.un(&#x27;postcompose&#x27;, moveFeature);
}

var speed, now;
var animating &#x3D; false;
var speedInput &#x3D; document.getElementById(&#x27;speed&#x27;);
var startButton &#x3D; document.getElementById(&#x27;start-animation&#x27;);
startButton.addEventListener(&#x27;click&#x27;, startAnimation, false);
</textarea>
          <textarea class="hidden" name="css"></textarea>
          <textarea class="hidden" name="html">&lt;div class&#x3D;&quot;row-fluid&quot;&gt;
  &lt;div class&#x3D;&quot;span12&quot;&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;
&lt;div class&#x3D;&quot;row-fluid&quot;&gt;
  &lt;div class&#x3D;&quot;span12&quot;&gt;
    &lt;label for&#x3D;&quot;speed&quot;&gt;
      speed:&amp;nbsp;
      &lt;input id&#x3D;&quot;speed&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;10&quot; max&#x3D;&quot;999&quot; step&#x3D;&quot;10&quot; value&#x3D;&quot;60&quot;&gt;
    &lt;/label&gt;
    &lt;button id&#x3D;&quot;start-animation&quot;&gt;Start Animation&lt;/button&gt;
  &lt;/div&gt;
&lt;/div&gt;
</textarea>
          <input type="hidden" name="wrap" value="l">
          <input type="hidden" name="resources" value="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css,https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js,http://openlayers.org/en/v3.11.1/css/ol.css,http://openlayers.org/en/v3.11.1/build/ol.js">
        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Animate a feature movement&lt;/title&gt;
&lt;script src="https://code.jquery.com/jquery-1.11.2.min.js"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"&gt;
&lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" href="http://openlayers.org/en/v3.11.1/css/ol.css" type="text/css"&gt;
&lt;script src="http://openlayers.org/en/v3.11.1/build/ol.js"&gt;&lt;/script&gt;

&lt;/head&gt;
&lt;body&gt;
&lt;div class="container-fluid"&gt;

&lt;div class&#x3D;&quot;row-fluid&quot;&gt;
  &lt;div class&#x3D;&quot;span12&quot;&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;
&lt;div class&#x3D;&quot;row-fluid&quot;&gt;
  &lt;div class&#x3D;&quot;span12&quot;&gt;
    &lt;label for&#x3D;&quot;speed&quot;&gt;
      speed:&amp;nbsp;
      &lt;input id&#x3D;&quot;speed&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;10&quot; max&#x3D;&quot;999&quot; step&#x3D;&quot;10&quot; value&#x3D;&quot;60&quot;&gt;
    &lt;/label&gt;
    &lt;button id&#x3D;&quot;start-animation&quot;&gt;Start Animation&lt;/button&gt;
  &lt;/div&gt;
&lt;/div&gt;

&lt;/div&gt;
&lt;script&gt;
// This long string is placed here due to jsFiddle limitations.
// It is usually loaded with AJAX.
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].join(&#x27;&#x27;);

var route &#x3D; /** @type {ol.geom.LineString} */ (new ol.format.Polyline({
  factor: 1e6
}).readGeometry(polyline, {
  dataProjection: &#x27;EPSG:4326&#x27;,
  featureProjection: &#x27;EPSG:3857&#x27;
}));

var routeCoords &#x3D; route.getCoordinates();
var routeLength &#x3D; routeCoords.length;

var routeFeature &#x3D; new ol.Feature({
  type: &#x27;route&#x27;,
  geometry: route
});
var geoMarker &#x3D; new ol.Feature({
  type: &#x27;geoMarker&#x27;,
  geometry: new ol.geom.Point(routeCoords[0])
});
var startMarker &#x3D; new ol.Feature({
  type: &#x27;icon&#x27;,
  geometry: new ol.geom.Point(routeCoords[0])
});
var endMarker &#x3D; new ol.Feature({
  type: &#x27;icon&#x27;,
  geometry: new ol.geom.Point(routeCoords[routeLength - 1])
});

var styles &#x3D; {
  &#x27;route&#x27;: new ol.style.Style({
    stroke: new ol.style.Stroke({
      width: 6, color: [237, 212, 0, 0.8]
    })
  }),
  &#x27;icon&#x27;: new ol.style.Style({
    image: new ol.style.Icon({
      anchor: [0.5, 1],
      src: &#x27;data/icon.png&#x27;
    })
  }),
  &#x27;geoMarker&#x27;: new ol.style.Style({
    image: new ol.style.Circle({
      radius: 7,
      snapToPixel: false,
      fill: new ol.style.Fill({color: &#x27;black&#x27;}),
      stroke: new ol.style.Stroke({
        color: &#x27;white&#x27;, width: 2
      })
    })
  })
};

var vectorLayer &#x3D; new ol.layer.Vector({
  source: new ol.source.Vector({
    features: [routeFeature, geoMarker, startMarker, endMarker]
  }),
  style: function(feature, resolution) {
    // hide geoMarker if animation is active
    if (animating &amp;&amp; feature.get(&#x27;type&#x27;) &#x3D;&#x3D;&#x3D; &#x27;geoMarker&#x27;) {
      return [];
    }
    return [styles[feature.get(&#x27;type&#x27;)]];
  }
});

var center &#x3D; [-5639523.95, -3501274.52];
var map &#x3D; new ol.Map({
  target: document.getElementById(&#x27;map&#x27;),
  loadTilesWhileAnimating: true,
  view: new ol.View({
    center: center,
    zoom: 10,
    minZoom: 2,
    maxZoom: 19
  }),
  layers: [
    new ol.layer.Tile({
      source: new ol.source.BingMaps({
        imagerySet: &#x27;AerialWithLabels&#x27;,
        key: &#x27;Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3&#x27;
      })
    }),
    vectorLayer
  ]
});

var moveFeature &#x3D; function(event) {
  var vectorContext &#x3D; event.vectorContext;
  var frameState &#x3D; event.frameState;

  if (animating) {
    var elapsedTime &#x3D; frameState.time - now;
    // here the trick to increase speed is to jump some indexes
    // on lineString coordinates
    var index &#x3D; Math.round(speed * elapsedTime / 1000);

    if (index &gt;&#x3D; routeLength) {
      stopAnimation(true);
      return;
    }

    var currentPoint &#x3D; new ol.geom.Point(routeCoords[index]);
    var feature &#x3D; new ol.Feature(currentPoint);
    vectorContext.drawFeature(feature, styles.geoMarker);
  }
  // tell OL3 to continue the postcompose animation
  map.render();
};

function startAnimation() {
  if (animating) {
    stopAnimation(false);
  } else {
    animating &#x3D; true;
    now &#x3D; new Date().getTime();
    speed &#x3D; speedInput.value;
    startButton.textContent &#x3D; &#x27;Cancel Animation&#x27;;
    // hide geoMarker
    geoMarker.setStyle(null);
    // just in case you pan somewhere else
    map.getView().setCenter(center);
    map.on(&#x27;postcompose&#x27;, moveFeature);
    map.render();
  }
}


/**
 * @param {boolean} ended end of animation.
 */
function stopAnimation(ended) {
  animating &#x3D; false;
  startButton.textContent &#x3D; &#x27;Start Animation&#x27;;

  // if animation cancelled set the marker at the beginning
  var coord &#x3D; ended ? routeCoords[routeLength - 1] : routeCoords[0];
  /** @type {ol.geom.Point} */ (geoMarker.getGeometry())
    .setCoordinates(coord);
  //remove listener
  map.un(&#x27;postcompose&#x27;, moveFeature);
}

var speed, now;
var animating &#x3D; false;
var speedInput &#x3D; document.getElementById(&#x27;speed&#x27;);
var startButton &#x3D; document.getElementById(&#x27;start-animation&#x27;);
startButton.addEventListener(&#x27;click&#x27;, startAnimation, false);

&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
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